ROBBE Hot Shot 3078 Building Instructions

Brand: ROBBE

Model: Hot Shot 3078

Category: Remote controlled toys

Type: Building Instructions

Montage- und Bedienungsanleitung

Assembly and operating instructions

Notice de montage et d´utilisation

Hot Shot

No. 3078

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Hot Shot

3078

Building instructions Order No.

Specification

Wingspan: approx. 1530 mm

Total flying surface area: approx. 33 dm

All-up weight, glider: approx. 650 g

All-up weight incl. power system: approx. 900 g

Wing section: E 186 mod.

Please see separate sheet for details of essential items not

included in the kit.

Refer to the main robbe catalogue for details of tools and

aids to building.

Sequence of assembly

In general terms the part numbers correspond to the sequence

of assembly; the number before the point indicates the Stage of

construction, the number after the point the individual compo-

nent.

Study the plan, the building instructions and the parts list before

starting construction, so that you have a clear idea at the outset

how the model goes together.

In the centre of these instructions you will find eight pages with

stage drawings. Pull the drawings out for reference.

The identification drawings „O“ is intended to help you locate

and identify the die-cut parts.

Write the part numbers on the die-cut parts, but do not separate

them from their sheets until they are needed. Clean up cut

edges carefully.

Where die-cut parts have to be glued together always be sure

to leave the punched points exposed, as they indicate hole

positions. The instructions tell you when to drill the holes.

Some parts, such as the strip wood, have to be cut to length

according to the plan. The instructions don’t mention this in

detail every time.

Please read the instructions supplied by the various adhesive

manufacturers. Allow glued joints to harden fully before con-

tinuing with construction.

Wherever epoxy is used remember to wipe off excess glue

while it is still soft.

All metal parts, such as pushrods, nuts etc., should be cleaned

and de-greased before installation.

When gluing nuts to wooden parts take care to keep the glue out

of the threaded section.

Directions such as „right-hand“ are as seen from the tail of

the model looking forward.

Radio control system

For the Hot Shot you need a radio control system with a dual

mixer designed for a V-tail. A low-profile (flat-pack) receiver

battery is also required.

Please check that your RC system components will fit in the

positions recommended before you start building the model.

If you intend to use a radio control system other than the one we

recommend, you can still the follow the basic arrangement

shown, but you may need to make minor changes to allow for

differences in component size.

Before you start construction set the servos to neutral from the

transmitter (transmitter sticks and trims central).

Installing the RC system

In its standard form this model’s receiving system components

are installed permanently in the wing.

If you wish to have access to these components you can

incorporate a removable hatch in the top sheeting. Details of

this are left up to the builder. In this case you will need open the

centre ribs to allow the battery to be fitted and removed.

The motor

For flat-field flying the model can be flown with an auxiliary

motor, mounted on a suitable pylon, for self-launching. The

motor is operated in non-throttled mode.

The materials for the motor pylon base are included in the kit.

The Order Nos. for the other parts required are listed on a

separate sheet.

Aero-tow release

An aero-tow release can be installed; details of the installation

are left up to the builder. Note that there is only space for a mini-

servo for this function.

Covering

We recommend robbe heat-shrink film for covering the model;

the film is supplied with full instructions. Please note that the

wooden parts must not be doped or sealed before the film is

applied. Simply rub down the wooden surfaces lightly with fine

glasspaper and remove all traces of sanding dust.

You can copy the colour scheme shown in the kit box illustration

if you wish.

The plans

The wing is built directly over the full-size drawing. The plan

should be taped down on a completely straight, flat building

board.

Cover the relevant area of the plans with thin clear household

film to avoid the parts sticking to the paper.

Hot Shot

3078

Building instructions Order No.

Building the model

Stage 1, the basic wing structure, parts 1.1 - 1.13

Part No. Description Material Dimensions in mm No. off Notes

1.1 Bottom sheeting Balsa 1.5 2

1.2 Bottom spar Spruce 3 x 7 x 850 2

1.3 Root rib Plywood 3 die-cut parts 2

1.4-1.9 Wingrib Balsa 2, die-cut 2 each

1.10 Tip rib Plywood 3, die-cut 2

1.11 Trailing edge Balsa 6:4.5 x 8.5 x 820 2 each Asymm. taper

1.12 Bottom T.E. sheeting Balsa 1.5 x 15 x 820 2

1.13 Top mainspar Spruce 3 x 7 x 850 2

Note: it is not absolutely essential to glue the ribs to the bottom

sheeting over the plan (building board), provided that you mark

the rib positions accurately on the sheeting beforehand.

The instructions describe the construction of one wing panel.

The second panel is built in exactly the same sequence, but as

a mirror-image of the first.

- Mark the position of the ribs on the bottom sheeting 1.1 as

shown on the plan.

- Glue the bottom mainspar 1.2 to the bottom sheeting 1.1 flush

with the rear edge.

- Glue the root rib 1.3 and ribs 1.4 - 1.10 to the bottom

mainspar; check that they are exactly at right-angles when

viewed from the front.

- Ensure that the ribs make good contact with the bottom

sheeting. If necessary pin the ribs down to the sheeting until

the glue has set hard.

- Glue the trailing edge 1.11 to the trailing edge sheeting 1.12.

Check that the trailing edge strip is the right way up, as it is

not symmetrical, as shown in the detail drawing "Z".

- The following steps must be carried out directly on the

building board (plan).

- Pin down the assembled trailing edge 1.11, 1.12 over the

plan, leaving an equal overhang at right and left.

- Place the wing framework against it and glue the ribs in place.

- Pin down the bottom mainspar on the building board and glue

the top mainspar 1.13 in place. Check that the root rib 1.3 is

at right-angles to the bottom mainspar 1.2 - detail drawing

"Y".

- Remove the wing framework and sand the projecting parts

back flush with the outside shape of the ribs 1.3 and 1.10.

Stage 2, the basic wing structure, parts 2.1 - 2.8, HL

Part No. Description Material Dimensions in mm No. off Notes

„HL“ Jig strip Balsa 3 x 3 x 850 2

2.1 Outside doubler Plywood 3, die-cut 2

2.2 Centre doubler Plywood 3, die-cut 2

2.3 Top T.E. sheeting Balsa 1.5 x 15 x 820 2

2.4 Battery former Plywood 3, die-cut 2

2.5 Half-rib Plywood 3, die-cut 2

2.6 Spar webbing Balsa 1.5, overlength 24

2.7 Top sheeting Balsa 1.5 x 59 x 800 2

2.8 Leading edge Balsa 9 x 14 x 890 2

- Pin down the jig strip „HL“ over the plan, flush with the line of

the trailing edge strip.

- Place the wing structure over the plan and pin it to the building

board and the jig strip „HL“.

- Glue the doublers 2.1 and 2.2 to the ribs 1.3 and 1.10.

- Glue the top trailing edge sheeting 2.3 in place and cut off the

excess length.

- Glue together the battery former 2.4 and the half-rib 2.5 at

right-angles. Check that the half-rib 2.5 follows the wing

section correctly.

- Glue this assembly in place flush with the front edge of the

bottom sheeting. Use the extended lines on the plan as a

guide.

- Each of the spar webs 2.6 consists of two parts with the wood

grain vertical. Trim them to fit between the ribs 1.4 - 1.10 and

glue them in place. Do not fit webbing in the bay between ribs

1.3 and 1.4.

- Check carefully that the wing is resting squarely on the

building board. Glue the top sheeting 2.7 to the structure and

pin it in place.

- Allow the glue to set hard, then remove the wing from the

board. Sand back the ribs and the excess sheeting material

at the front face of the wing until you achieve a completely flat

surface for the leading edge.

- Glue the leading edge 2.8 to the wing.

- Sand the leading edge flush with the root and tip ribs and sand

to the proper section as shown on the plan.

Hot Shot

3078

Building instructions Order No.

Stage 3, joining the wing panels, parts 3.1 - 3.9

Part No. Description Material Dimensions in mm No. off Notes

3.1 Centre rib Plywood 3, die-cut 1

3.2 Receiver battery — Ready made 1 Not included

3.3 Bottom spar Spruce 3 x 7 x 850 1

3.4-3.6 Sheeting Balsa 1.5, die-cut 1 each

3.7 Rib capstrip Balsa 1.5, 6 x 820 8 overlength

3.8 Sheeting Balsa 1.5, die-cut 2

3.9 Top spar Spruce 3 x 7 x 850 1

- Glue the centre rib 3.1 to one wing panel, checking that it is

flush all round.

- Slide the receiver battery 3.2 into place, running the cable out

of the wing.

- The next step is to glue the wing panels together, and this

must be done flat on the building board.

- Pin down the jig strip „HL“ in the central area.

- Temporarily hold the wing panels together over the plan and

trim the central area if necessary to obtain a close fit.

- Glue the wing panels together using white glue, checking

carefully that the ribs meet up neatly, with all edges flush.

- Place the complete wing back on the building board and pin

down the trailing edge. Hold the parts together at the

centreline with clothes pegs and allow the glue to cure

completely.

- Remove the wing from the building board.

- Trim the bottom spar 3.3 to fit and glue it in place flush with

the mainspar 1.2.

- Trim the bottom sheeting panels 3.4 - 3.6 to fit in turn, and

glue them in place. Check that the battery cable and switch

openings are on the same side.

- Trim the rib capstrips 3.7 and the sheeting panel 3.8 to fit as

shown on the plan, and glue them to the structure.

- Locate the marked hole positions in the centre rib and drill

them 4 mm Ø.

- Pin down the wing on the building board again, with the

jig strip „HL“ in place, then trim the top spar 3.9 to fit and

glue it in place.

Stage 4, installing the radio control system, parts 4.1 - 4.12

Part No. Description Material Dimensions in mm No. off Notes

4.1 Webbing Balsa 1.5 x 59 x 800 8

4.2 Servo output arm Plastic Inj. moulded 2 Incl. with 4.3

4.3 Servo — Ready made 2 Not included

4.4 Support Plywood 3, die-cut 1

4.5 Switch — Ready made 1 Not included

4.6 Charge socket holder — Ready made 1 Not included

4.7 Receiver — Ready made Not included

4.8-4.10 Sheeting Balsa 1.5, die-cut 1 each

4.11 Rib capstrip Balsa 1.5 x 6 x 820 8 overlength

4.12 Sheeting Balsa 1.5, die-cut 2

- Glue the webbing pieces 4.1 to the spars 3.3 and 3.9 and the

appropriate ribs as shown on the plan and as described for

parts 2.6. Remove the wing from the building board.

- The next step is to prepare the receiving system. Cut down

the servo output arms 4.2 for the servos 4.3 as shown on the

plan.

- Connect the receiving system components ready to use.

Switch on the transmitter and activate the V-mixer. Note: the

V-mixer must be switched on permanently when the

model is in the air. Check that the transmitter trims are at

centre, so that the servos are at their true neutral.

- Fit the servo output arms on the servos as shown in the plan

view and the detail drawing "X". They must point vertically

down when fitted.

- Fit the output screws to secure the servo output arms.

- Glue the servos in the position shown in the plan view using

a little epoxy. Check that the output arms protrude through

the centre of the slots in the bottom sheeting.

- Glue the support 4.4 to the inside of the sheeting, with the

openings exactly in line.

- Install the switch 4.5 and the charge socket holder 4.6.

- Secure the switch with a drop of epoxy; this allows you to

remove the switch bezel prior to covering the wing.

- Insert the switch harness charge socket in the holder 4.6.

- Connect the entire receiving system, and stick the receiver

4.7 in place with a few drops of epoxy. Keep the glue well

away from the crystal socket.

- Cut small holes in the wingribs for the receiver aerial, and

deploy the flexible aerial along the length of the wing. Apply

a small drop of glue to the end of the aerial to prevent it

slipping out of place.

- Rotate the servo output arms to the rear so that they are out

of the way when you sand and cover the wing.

- Trim the following parts to fit and glue them in place as

described for the underside of the wing: the top sheeting

panels 4.8 - 4.10, the rib capstrips 4.11 and the sheeting 4.12.

- Sand the completed wing overall, taking particular care to

maintain the correct airfoil section at the leading edge.

Hot Shot

3078

Building instructions Order No.

Stage 5, winglets and control surfaces, parts 5.1 - 5.12, "S"

Part No. Description Material Dimensions in mm No. off Notes

5.1 Wingtip Plywood 3, die-cut 6

5.2 Winglet Balsa 1.5, die-cut 4

5.3 Sealing piece Plywood 3, die-cut 4

5.4 Screw Steel 3.9 Ø x 16 4

5.5 Control surface Balsa Machined 2

5.6 Adhesive tape Plastic 19 wide - Not included

5.7 Pushrod Steel rod 1.5 x 150 2 One Z-bend

5.8 Horn Plastic Inj. moulded 2

5.9 Pushrod coupler Alu Ready made 2

5.10 Screw Steel M2 x 6 2

5.11 Self-tapping screw Steel 2.2 Ø x 13 4

5.12 Spreader plate Plastic Inj. moulded 2

„S“ Template Plywood 3, die-cut 1

- Glue together parts 5.1 in threes to form the two wingtips,

keeping the edges flush.

- Glue the wingtip assemblies to the wing.

- Remove the pairs of winglets 5.2 from the die-cut sheets and

glue them together with the edges flush.

- Glue together the sealing pieces 5.3 and round them off as

shown in the plan view.

- Glue parts 5.3 to the outside of the winglets, flush with the

bottom edge.

- Drill 2.5 mm Ø holes in the winglets at the punched points,

hold them in position, mark the position of the holes on the

ribs 1.10 and drill them. Drill out the holes in the winglets using

a 4 mm Ø bit.

- Carefully countersink the holes in the sealing pieces using an

8 mm Ø drill held in your hand. Apply thin cyano to the

countersunk areas to harden the wood.

- Offer up the winglets again and fit the screws 5.4 to secure

them to the wing.

- Round off the winglet assemblies neatly as shown on the

plan.

- Cut the control surfaces 5.5 to shape as shown in the plan

view and the cross-sections, trim them as necessary and

plane them to the correct section (A - A) over their entire

length. Sand the planed surfaces smooth to produce the final

airfoil section.

- The wing, winglets and control surfaces can now be covered.

Notes on covering:

- Remember to leave an uncovered strip 6 mm wide either side

of the centreline on the underside of the wing. This provides

a bare wood surface to which the fuselage will be glued later.

- Remove the winglets, cover them separately and then screw

them to the wing again.

- When you have covered the whole model, attach the control

surfaces to the wing using a full-length strip of adhesive tape

5.6 along the top of the pivot line. Apply short strips of tape to

the underside of the hinge to prevent the control surfaces

coming loose.

- Check that both control surfaces move freely up and down,

and that they can move at least as far as the recommended

travels.

- Cut away the covering over the openings for the servo output

arms, the switch, the charge socket and the motor pylon.

- Set the servos to neutral again from the transmitter.

- Connect the pushrods 5.7 to the servo output arms.

- Drill out the linkage holes in the horns 5.8 to 2 mm Ø.

- Mount the pushrod couplers 5.9 on the horns using the

screws 5.10, and check that they rotate freely but with

minimum lost motion.

- Slip the couplers on the free end of the pushrods.

- Place the horns on the control surfaces in the position shown

in the side view and the cross-section on the plan, and drill 2

mm Ø holes for the retaining screws.

- Attach the horns to the control surfaces using the screws 5.11

and spreader plates 5.12. Shorten the screw ends.

- Set up the control surfaces to the correct neutral position

using the template „S“, and tighten the screws 5.10.

Stage 6, fuselage and motor pylon, parts 6.1 - 6.12

Part No. Description Material Dimensions in mm No. off Notes

6.1 Fuselage outside panel Plywood 3, die-cut 2

6.2 Fuselage outside panel Plywood 3, die-cut 2

6.3-6.5 Fuselage core Plywood 3, die-cut 1 each

6.6 Screw Plastic M4 x 2

6.7 Pylon baseplate Plywood 3, die-cut 1

6.8 Captive nut Steel M4 2

6.9 Pylon section, outside Plywood 3, die-cut 2

6.10 Pylon section, core Plywood 3, die-cut 1

6.11 Triangular strip Balsa 15 x 15 x 2

6.12 Towhook Stell 2.4 Ø x 8 x 20 1

Hot Shot

3078

Building instructions Order No.

Note: if you intend to install an aero-tow release, remember to

cut the slots "A" and "S" in one of the two fuselage panels 6.1,

6.2 to take the pushrod.

When you have glued the fuselage components together you

can saw out the slot "N" through which the towline is engaged.

To operate the release you will need a servo no larger than mini-

size as space is restricted. The servo can be installed aft of one

of the two standard servos for the control surfaces.

- Glue together the outside fuselage panels 6.1 and 6.2 in pairs

with their edges flush.

- Glue the three core components 6.3 - 6.5 to one outside

panel, aligning the parts by lining up the holes. Glue the

assemblies together with their edges flush.

- Drill out the holes using a 4 mm Ø drill.

- Sand the fuselage to a harmonious shape as shown in the

plan view and the cross-sections. Note that the top face must

be left flat.

- Cover or paint the fuselage, again leaving the top surface (the

joint area) bare and untreated.

- Apply a little oil to the threaded shank of the screws 6.6 to

prevent them becoming stuck. Fit the screws 6.6 through the

wing from the top to act as locators. Glue the fuselage to the

underside of the wing.

- Drill 5.5 mm Ø holes in the motor pylon baseplate 6.7.

- Press the captive nuts 6.8 into the holes and apply a drop of

cyano round the edges to secure them.

- Glue together the three parts 6.9 and 6.10 to form the motor

pylon. Note that the joint surface on the underside must be left

perfectly flat.

- Drill out the holes for the screws 6.6 to 4 mm Ø.

- Oil the threads of the screws 6.6 again lightly. Fit the screws

6.6 from the underside to act as locators for the pylon.

- Glue the complete pylon assembly on the baseplate, and

check that the parts are exactly at right-angles.

- Relieve the triangular strips 6.11 slightly to provide clearance

for the captive nuts, and glue the strips on both sides.

- Sand the completed motor pylon base overall.

- If you decide to use the motor pylon it can be attached to the

model using the screws 6.6. Check that the ailerons are not

obstructed in their movement. If necessary trim the pylon

mount base until you are satisfied.

- Paint the completed pylon mount with fuel-proof lacquer to

prevent it absorbing fuel.

- Note on the motor pylon (robbe Pylon Tank):

- Assemble and install the pylon tank as described in the

instructions supplied with it. Install the glowplug motor and

accessories.

- Disable the throttle barrel.

- Use the spacer sleeve ø 5 x x 6 x 10 mm to mount the propeller

if you need.

- Important: be sure to set the motor thrust line as shown in the

side view on the plan.

- Screw in the towhook 6.12 if you intend using a bungee

system to launch the model.

Balancing

Mark the Centre of Gravity „C.G.“ on the fuselage on both sides

as shown on the plan.

Support the model at the marked points and allow it to hang

freely. Ideally it will balance level with the nose inclined slightly

down.

If the tail hangs down, you will need to add lead ballast to the

nose. If the nose hangs down too far, fit lead ballast at the tail

of the fuselage. In either case the easiest method is to drill a

hole and fill it with lead.

Fix any lead ballast carefully (i.e. glue it in place) so that there

is no chance of it shifting in flight.

Note: the motor pylon is located exactly at the model’s Centre

of Gravity.

This means that you can safely fly the model with or without the

pylon, as the model’s balance will not alter. Provided that you

use the recommended components there is no need to re-

balance the model.

Checking the working systems:

Switch on the RC system and check that all trims on the

transmitter are at neutral (centre).

The control surfaces must now also be at neutral as defined by

the template „S“. Check the setting of the control surfaces

carefully using the template „S“ once more. Adjust the pushrods

if necessary.

The next step is to check the direction of rotation of the servos:

stand behind the model and move the aileron stick to the right.

The trailing edge of the right-hand control surface should now

rise, the left-hand one fall.

Pull the elevator stick back towards you and the trailing edge of

both control surfaces should rise.

If either servo operates in the wrong direction, reverse it using

the servo reverse facility on your transmitter.

Set the control surface travels as stated in the drawing.

Hot Shot

3078

Building instructions Order No.

Test flying

The Hot-Shot should be given a test-glide or two before the first

powered flight.

If you have fitted a motor pod, remove it for the test-glide

procedure. This is quite safe, as the pod produces no change

in the model’s CG.

Wait for a day with as little breeze as possible for test-gliding the

Hot-Shot. For the first few flights seek out a large, open field

devoid of obstructions (trees, fences etc.).

Carry out one last check of the working systems.

Grip the glider in one hand at its balance point, with the

transmitter in the other hand. Hold the model level at around

head-height and point it directly into wind.

Trot forward for a few paces and give the model a powerful

launch straight ahead, with the nose slightly above horizontal.

Use the controls if necessary to place the model in a steady,

even glide, and adjust the trims if necessary - flight path „A“.

If the model follows flight path „B“ apply down-elevator to

correct; if the model follows flight path „C“ apply up-elevator to

correct.

If you need to adjust the trims to obtain a flat glide, adjust the

pushrod lengths when the model is back on the ground so that

you can return the transmitter trims to centre; this ensures that

full trim travel is available for subsequent flights.

Repeat the test-glide procedure until you are satisfied that the

model is trimmed correctly, but take care to use the controls as

little as possible while the model is close to the ground.

Once the model is trimmed correctly for the glide you can

confidently fit the power pod and try a powered flight.

Keep well clear of the rotational plane of the propeller when

the motor is running, as the spinning blades can easily

injure you.

Start the motor, adjust it carefully and give the model a powerful

launch exactly into wind, with the nose inclined slightly up.

You may find that you need to apply moderate up-elevator to

prevent the model diving (flight path „C“).

Note that flying wing model aircraft tend to respond more

directly to elevator commands than conventional models, so be

gentle with the elevator stick when correcting the flight path.

Allow the Hot-Shot to fly in a straight line; don’t try to turn it when

it is close to the ground.

Prevent the model climbing at too steep an angle otherwise it

could stall.

Adjust the trims if necessary to produce a steady climb under

power.

Land the model on the glide after the motor has stopped.

robbe Modellsport GmbH & Co. KG

We reserve the right to alter technical specifications.

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ROBBE Hot Shot 3078 Building Instructions

Brand: ROBBE

Model: Hot Shot 3078

Category: Remote controlled toys

Type: Building Instructions

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